Finding the Third Proportional to 357,042 and 489,586.50

Step by Step Solution

1. Step 1: Write the proportion equation
   357,042 : 489,586.50 = 489,586.50 : x
2. Step 2: Convert to fraction form
   357,042/489,586.50 = 489,586.50/x
3. Step 3: Cross multiply
   357,042x = 489,586.50 × 489,586.50
4. Step 4: Simplify right side
   357,042x = 239,694,940,982.25
5. Step 5: Solve for x
   x = 239,694,940,982.25/357,042
6. Step 6: Final answer
   x = 671,335.42